DPF

[countrybumpkin]

My NX did that a few times during a regen, then started doing it when started when cold. Finally it started throwing a CEL and had to have the injectors replaced, a few years and several hundred hours later not a sign of any smoke.

 

[finn1]

The common rail fuel system goes into a post injection mode during regeneration. The post injection occurs after the normal power stroke and essentially passes fuel through the partially open exhaust valve into the manifold and DPF.

If the DPF is at a relatively low temperature this fuel may result in momentary white smoke until the temperature is high enough for the regeneration reaction to begin.

 

[Threepoint]

Prenshaw2, did you notice whether your regen light was on during the white smoke episodes? From your description, I'm assuming not. Per Countrybumpkin's and Finn1's posts, that might tell us more if it was.

 

[rademamj1]

I assume this fuel rich process is mainly occurring during a regen cycle, and this extra fuel is what burns the particulates out of the DPF. Unburned fuel during a regen comes out as white smoke. It should go away shortly.

I one time shut off the tractor, and just as I was turning the key, saw the regen light is on. Too late. Tractor was already turned off. Waited 1 minute and restarted tractor, and saw for the first time a puff of white smoke. Revving up to 2600 PTO speed, smoke went away and then regen light came back on. Automatic regen continued for 12 mins, and everything was back to normal.

 

[prenshaw2]

Prenshaw2, did you notice whether your regen light was on during the white smoke episodes? From your description, I'm assuming not. Per Countrybumpkin's and Finn1's posts, that might tell us more if it was.

No, the light has not come on yet, only 20 hours on tractor, and 1/2 tank fuel used.

 

[Threepoint]

Wow, if you're getting 20 operating hours on 11 gallons, that RX is just sipping fuel!

No, the light has not come on yet, only 20 hours on tractor, and 1/2 tank fuel used.

 

[prenshaw2]

Wow, if you're getting 20 operating hours on 11 gallons, that RX is just sipping fuel!

I have only used it for moving round bales, splitting firewood, and grading my horse riding ring with a soil pulverizer so far. I just ordered a nova MXZ240 flail mower so it will get some pretty decent usage here in a little while. I am willing to bet my fuel consumption won稚 be so light then LOL.

 

[prenshaw2]

At 29 hours the regen light came on, I set the RPMs up like it said to, and it did it's thing. Ran for 10-15 minutes at higher RPMs and then light went off. All seems well, and this thing is a beast (which is why I got a bigger one) compared to my other one when I cleared out a fence row.

 

[MickeyDBC]

It is tree planting season for us so the tractor gets a lot of idling time (idles for ten minutes and then a couple of minutes of pto speed for the auger - wash, rinse, repeat) and it finally did a non mowing/discing regen. Noticed it was stinking and saw the light on so I set the idle to 1500 and it finished in about ten minutes. It is amazing how good these machines are on fuel. Running all day long like this is less than a gallon an hour.

 

[deserteagle71]

I It is amazing how good these machines are on fuel. Running all day long like this is less than a gallon an hour.

I agree. When I first got my Kubota (20 hp more than my old John Deere) I was sure I'd be burning a lot more fuel per hour doing the same work. I was wrong. Despite having the DPF it is better on fuel than the John Deere.